Machine foe forming screw blanks for wrenches



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MAGHINE POBJ FORMING SCREW BLANKS FOR WRENGHES. No. 393,618. Patented'lov. 27, 1888.

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MACHINE FOR PORMING SCREW BLANES EUR WRBNGHBS'.

No. 393,618. PatentedNov. Z7, 1888'.

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UNITED STATES PATENT OFFICE.

LORING COES, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO rIHE COES WRENCH COMPANY, OF SAME PLACE.

MACHINE FOR FORMING SCREW-BLANKS FOR WRENCHES.

SPECIFICATION forming part of Letters Patent No. 393,618, dated November 2'7, 1888.

Application filed August 3l, 1868. Serial No. 284,266. (No model.)

To all whom it may concern.-

Be it known that I, LORING CoEs, a citizen of the United States, residing at Worcester, in the county of Worcester and State of Mas- 5 sach usetts, have invented certain new and useful Improvements in Machines for Producing Rosette-Screw Blanks for Wrenches, of which the following, togetherwith theaccompanying drawings, is a specification sufficiently full,

1o clear, and exact to enable persons skilled in the art to which this invention appertains to make and use the same.

The object of my present invention is to provide -a practical and efficient machine for pror 5 ducing rosetteheads for the adjusting-screws of monkey-wrenches, whereby the operation of heading can be performed in an economical Y and expeditious manner, and which will form the rosettes or heads axially coincident with 2O the body or shaft of the blank, and of uniform and concentriccylindricity on all' of the blanks or product, so that the subsequent operations of screw-threading and nishing (wherein the blanks are held and rotated by their rosettes or heads in suitable chucks) can be performed with facility and convenience and a perfect product obtained without excessive cutting away of material. These objects I attain by the mechanism shown and described, the particular subject-matter claimed being hereinafter definitely specified. In the drawings, Figure 1 is a vertical section of my improved machine through the headingdies in the direction of line w w. Fig. 2 is a rear view. Fig. 3 is a horizontal section below the upper dies at line w x, Fig. 2. Fig. 4 is a bottom view of the upper die carrier. Fig. 5 is a vertical sectional view showing the details of the heading-dies and discharge-pin on somewhat larger scale. Fig. 6 is a vertical section of the iirst former to'p die. Figs. 7 and 8 show end views of the top and bottom dies, respectively. Fig. 9 is a section of the discharging-pin. Fig. l0 is a plan View showing details of the mechanism for intermittently rotating the die-carrier. Fig. l1 shows the rosette-screw blank after the first pressure. Fig. l2 shows the blank or product after final pressure, and Fig. 13 the complete iinished rosettescrew as used in wrenches of 5o the class referred to.

My improved machine comprises the following described parts, combined and organized for operation substantially as in the drawings, whereon A denotes a suitable frame for supporting the parts. B indicates the operatingshaft arranged to turn in bearingsat the upper part of the frame, and having a crank,

I), for reciprocating the pressing-follower C, which is connected thereto by the arm C', and 6c which works up and down in suitable guideways, (t, on the sides of the frame, and provided with a drivingwheel, B', that runs loose on the shaft, and an automatic stop-clutch, B2, whereby the drivewheel can be connected for rotating the shaft. The clutch B2 can be of any well known construction of that kind which automatically throws itself out of engagement at the completion of a revolution of' the shaft, such clutches being common on 7o pressing, cutting, and other machines where intermittent action is desired. A lever, E, and spring-actuated connecting-bar E are provided for throwing the clutch B2 into engagement for starting the operating-shaft.

The bottom die, D, is held in a suitable dieblock, D, that rests on the bed A', as indi-l cated, while the top dies, I, are supported in a rotating carrier, F, fixed on the lower end of a vertical shaft, F', mounted in bearings 8o on the rear side of the follower C, and provided with ratchet mechanism for rotating said shaft and carrier to bring the respective top dies, I, into working position over the bottom die automatically as the follower rises S5 and falls. Said ratchet mechanism is shown in Figs. 2 and 10. A ratchet-wheel, G, is vfixed to the shaft F', and adjacent thereto an arm, H, is mounted to swing loosely on said shaft, carrying a pivoted pawl, J, that engages 9o the ratchets of the wheel G. The arm H is connected byachain, h, with asuitable spring,

H', attached to an arm fixed to the follower. Said spring and chain serve for drawing back the arm and pawl. A cam or guide-plate, K, is fixed on a cross-bar, A2, attached to the frame A, which cam engages with the end of the arm H for'moving it forward. A spring,

j, presses the pawl into engagement with the notches of the ratchet-wheel. A sheave or roo pulley, g, for changing the direction of the chain h, is in the present instance employed,

as shown. \Vhen the follower() moves downward, the spring draws back the arm H, the pawl J moving freely over the ratehets to take a new hold. Then when the follower rises the cam K forces the arm H forward, and the pawl J, engaging a notch in the wheel G, causes partial rotation of the shaft F and earrier F sufficient to bring a succeeding top die, I, into working position.

The carrier F is provided with a series of recessesf in, at its periphery, one of which, when the dies are closed together, engages with a guide plate or stud, M, fixed on the lower dic-block, thereby insuring the accurate registry of the upper and lower dies, the one with the other.

The top dies, I,are made in plain cylindrical form, with square ends, and the i1eadiug-inatrix i is formed in the end thereof concentric with the cylinder. A number of these cylindrical dies are fitted into correspondingiy-shaped openings formed inthe rotating carrier F and retained therein by set-screws f, as indicated. The first-former matrix t' is shaped substantially as shown in Fig. 6, for producing the shape of head shown inFig.`l1, while the second-former matrix t" is made as shown in Fig. 5. In the present instance six top dies, I, (three seta) are fitted in the carrier F; but other number (more or less) may be used, if preferred. The carrier F is rclatively disposed so that the dies I, when in working position, will stand directly beneath the follower C, thus giving the pressure for forming the heads direct on the dies and without undue strain on the shaft F and ratchet mechanism. rIhe lower die is also made of cylindrical form, but with a supporting-shoulder, J, upon its exterior. its matrix is formed, as shown in Figs. 5 and 8, with an opening, d, corresponding to the size of the bar or rod on which the head is to be formed, extending completely through the axis of the die. This opening is preferably slightly ta pered, being largest at its upper part. These cylindrical dies, as shown, can be readilyconstrneted and conveniently fitted up, thus al'- t'ording great economy in the maintenance and renewal of the mechanism.

A, discharging-pin, N, is arranged beneath the die l) and supported by a -shoulder, n, that rests on a plate or frame, a, Vlts upper end extends into the opening d in the lower die, terminating at proper position for sustaining the rosette-screw blank with its iop end projecting sufficiently for upsetting to form the head. The upper end of the discharging-pin N is longitudinally grooved, as at n, to permitscaleand dirt to drop l'rom the die between the surfaces.

A foot-treadie, I), pivoted at P in suitable bearings, extends beneath the end of the discharging-pin,whereby the operator, by pressing his foot on the treadle, can force the dischargingpin upward for ejeeting the headed blank or product from the die.

XV indicates a pipe for discharging` water for cooling the die and dicblock.

In the operation a bar of proper length to form the rosette-screw blank, and suitably heated at one end, is inserted into the lower die, D, its lower end resting on the top of the discharging-pin N and its upper heated end projecting above the die. 'fheatteudant then presses down the starting-lever E, thereby throwing in the clutch B2, and the drivingwheel, which is constantly in motion, causes a rotation of the shaft B, when the crank and arm C', by depressing the follower C, closes the top die, I, having the first former matrix i, down upon the die D and bar, upsetting its end and impressing thereon a partially-formed head, T, such as indicated in Fig. itl. Then as the follower rises the cam K, arm il, and pawl .l automatically shift the position of the carrier F, bringing into position a top die, l, having the secondformer matrix, z", which latter, by a second rotation of the shaft, is brought down upon the die D and bar, further upsetting the metal and producing a rosette-screw blank having a head, T, such as shown in Fig. 12. As the follower again rises, the carrier F is again automatically shifted to bring another die having a first-former matrix into position for operating on the next succeeding bar. The attendantreleases the starting-lever E, andthe clutch ii automatically throws off and the movement of thc shaft vl ceases. 'lhc attendant then, by placing his foot on thc treadle, forces up the discharging-pin and ejccts the headed blank or product from thc die D preparatory to placi ngauothcr heated bar therein. 'lhc rosettefscrcw blanks thus headed have their surplus metal pressed ont into a flange, t, about the center of the head 'l, the upper and lower angles of the head and inner shoulder being formed full and perfect, so that thc heads or roscttcs, after shearing off the flange t, are full, cylindrical, and perfectly in line with the shaft T2. The blanks can therefore be held and revolved accurately in machine.A for cutting the screw-threads and for turning up the rosette and bearing end L' when impart ing thc finished form indicated in Fig. 13, so that such fitting operations can be performed without trouble and inconvenience and without requiring an excess of' metal to be cnt away when finishing these parts.

By means of the movable carrier F and scries of headingldies I, having matrices fitted t'or imparting to the metal the intermediate and finished shapes necessary for properly working up the heads, and means for automatically bringing the top heading-dies successively into Working position with the lower die, D, which holds the bar or blank, I am enabled to form the complete head at a single heating of the metal and without removing the blank from its position in the die D until completed.

Another important feature of advantage in ICO IIO

the construction described is, that the operating parts of the machine are all above the Work, so that the scale or particles of oxidized metal which come oft' from the iron operated upon do not lodge between the bearing-surfaces, but fall away from the dies and mechanism without interfering with or wearing the operating parts.

What I claim as o'f my invention, and desire to secure by Letters' Patent, is

`1.V The combination, substantially as described, of the stationary die D, its support, the reciprocating follower, the rotating diecarrier supporting the top dies, its shaft F, mounted in bearings on said follower, and the ratchet mechanism, substantially as described, for automatically rotating said carrier to bring the respective top diesinto working position, as set forth.

2. The combination, substantially as described, of the die D, its support, the reciproeating follower C, the rotating carrier F, carrying a series of dies, I, and provided with recesses m, the ratchetwheel G on the carriershaft, the arm H, carrying pawl J, the chain 71., spring H', Ithe cam K, fixed on the frame, and the guide M, all disposed for operation as and for the purpose set' forth.

3. The combination, substantially as described, of the reciprocating follower C, the

rotating die-carrier mounted on said follower and carrying the series of top dies, l, the ratchet-wheel G, fixed on the axis of said diecar rier, the swinging arm H, carrying pawl J, the spring H', connected with said arm, the cam K, supported on the frame, the die D, the discharging-pin N, the treadle P, the operatingshaft B, the pitman-arm C', driving-wheel B, clutch B2, and clutch-operating lever E and connection E', for the purposes set forth.'

4i. In a heading-machine, the combination, with a single stationary die provided with a longitudinallygrooved bottom pin for supporting the heated bar, of a series of Aheadingdies, having matrices fitted for respectively imparting intermediate and finished shapes to the metal mounted in a rotatable reciprocating carrier, and mechanism, substantially as described, for consecutively bringing the re spective heading-dies of said series into working position with said stationary die automatically, whereby the heads are formed by successive impressions at a single heating of the metal, as set forth.

Witness my hand this 29th day of August, A. D'. 1888.

LORLNG COES. Witnesses:

Clins. H. BURLEIG-H, ELLA l?. BLENUs. 

